I think the Vizio is defective. I contacted Vizio, gave them all information then got an email back requesting that I re-send them the info that was attached to their response. Duh! Anyway, our brand new Vizio 32" drops the picture and sound, remote can't control change channels or shut TV off. Also, the power button on the TV can't turn the TV off. Pulling the plug out of the wall seems to reset the TV and everything starts working again including the remote.
We have a sound problem, as well. You can hear one speaker (actor) and the rest are drowned out. Very weird. Sound doesn't track with the speaker (person).

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tcon board fault. If you wish to get some details; visit the site linked here. Pull up older posts. http://electronicshelponline.blogspot.com/
Line faults & possible causes to LCD & Plasma screen are given with illustrations. You can get an idea about the fault to an extent. Faults to all LCD & Plasma screen are similar, irrespective of its brand and screen size

Look through the ventilation slits at the back of the TV with the room lights out. If you do not see white light light bleeding through the back, you have a back light failure. It could be the inverter circuit which lights up the CCFL ( cold cathode fluorescent lamp ). You will need professional help to replace it and could cost you about 70 to 100 $ to fix.

I have the same issue, its caused by the program powersaver when running an HDMI port. if you turn on the TV and your HDMI device close to the same time the info transfered between them tells the TV that the HDMI device is in sleep mode so the tv starts dark then fades black to save power. easy fix, turn on either the tv or HDMI device and wait till it is fully on before tunring on the other.